Neuerstellung

- Quelle: https://github.com/oxyplot/oxyplot

Source/OxyPlot.ImageSharp/PngExporter.cs

@@ -0,0 +1,80 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="PngExporter.cs" company="OxyPlot">
+//   Copyright (c) 2014 OxyPlot contributors
+// </copyright>
+// <summary>
+//   Provides functionality to export plots to png.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace OxyPlot.ImageSharp
+{
+    using System.IO;
+
+    /// <summary>
+    /// Provides functionality to export plots to png.
+    /// </summary>
+    public class PngExporter : IExporter
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PngExporter"/> class.
+        /// </summary>
+        /// <param name="width">The width in pixels of the exported png.</param>
+        /// <param name="height">The height in pixels of the exported png.</param>
+        /// <param name="resolution">The resolution in dots per inch (DPI) of the exported png.</param>
+        public PngExporter(int width, int height, double resolution = 96)
+        {
+            this.Width = width;
+            this.Height = height;
+            this.Resolution = resolution;
+        }
+
+        /// <summary>
+        /// Gets or sets the width in pixels of the exported png.
+        /// </summary>
+        public int Width { get; set; }
+
+        /// <summary>
+        /// Gets or sets the height in pixels of the exported png.
+        /// </summary>
+        public int Height { get; set; }
+
+        /// <summary>
+        /// Gets or sets the resolution in dots per inch (DPI) of the exported png.
+        /// </summary>
+        public double Resolution { get; set; }
+
+        /// <summary>
+        /// Exports the specified <see cref="PlotModel" /> to the specified file.
+        /// </summary>
+        /// <param name="model">The model.</param>
+        /// <param name="fileName">The file name.</param>
+        /// <param name="width">The width.</param>
+        /// <param name="height">The height.</param>
+        /// <param name="resolution">The resolution in dpi (defaults to 96dpi).</param>
+        public static void Export(IPlotModel model, string fileName, int width, int height, double resolution = 96)
+        {
+            var exporter = new PngExporter(width, height, resolution);
+            using (var stream = File.Create(fileName))
+            {
+                exporter.Export(model, stream);
+            }
+        }
+
+        /// <summary>
+        /// Exports the specified <see cref="PlotModel"/> to the specified <see cref="Stream"/>.
+        /// </summary>
+        /// <param name="model">The model.</param>
+        /// <param name="stream">The output stream.</param>
+        public void Export(IPlotModel model, Stream stream)
+        {
+            using (var rc = new ImageRenderContext(this.Width, this.Height, model.Background, this.Resolution))
+            {
+                var dpiScale = this.Resolution / 96;
+                model.Update(true);
+                model.Render(rc, new OxyRect(0, 0, this.Width / dpiScale, this.Height / dpiScale));
+                rc.SaveAsPng(stream);
+            }
+        }
+    }
+}